Tool Steel


H-13 Hot Work Tool Steel Data Sheet

H-13 is the most popular and most versatile, hot work tool steel, providing a good balance of toughness, heat check resistance, and high temperature strength, in addition to moderate wear resistance. It may be used for tool temperatures up to about 1000 F, with brief exposures up to 1100 F.

Chemical Composition

Carbon 0.40%
Manganese 0.35%
Chromium 5.20%
Molybdenum 1.30%
Vanadium 0.95%
Silicon 1.00%

Typical Applications

Extrusion Tools Diecasting Dies
Forging/Heading Dies Mandrels
Plastic Molds Ejector Pins
Powder Compaction Hardware

Cold Work Tool Steel Comparison Chart

Thermal Treatments

Preheat : 1100/1250F (595/675C), equalize, 1350/1450F (775/790C), equalize.

Austenize : 1825/1875F (995/895C), 30/45 minutes at temperature.

Quench : Air, positive pressure vacuum to 150F (65C), Interrupted oil to 150F(65C). NOTE: A minimum quench rate of about 25F per minute from 1800F down to about 1200F is recommended to achieve maximum impact toughness.

Temper : 1000/1200F (540/650C), hold 2 hours at temperature, air cool. Temper twice.

Cryogenic Treating : Refrigeration treatments may improve long term dimensional stability by transforming retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.

Hardness and Impact Toughness Data
Air cooled from 1850F(970C) Double tempered.


Deg. F Deg. C
As quenched
1000 540
1050 560
1100 590
1125 605
1150 620
1200 650


Hardness Charpy C-Notch
HRC Ft. Lbs. Joules
52 10 14
50 10 14
47 10 24
41 18 24
36 18

Surface Treatments

Because of its high tempering temperatures (>1000 F), H-13 may be treated by most surface treating processes, including conventional and ion nitriding, titanium nitriding, and other coatings or treatments. Nitrided surface hardness will be about 60/65 HRC.


A. Heat to 1600F (820C), hold 2 hours, slow cool 25F (0C)/hour maximum) to 1200F (650C), air cool.
B. Heat to 1600F (820C), hold 2 hours, cool to 1400F (760C), hold 6 hours, air cool to room temperature.
Typical annealed hardness: 192/235 BHN.

Stress Relieving

Annealed Material: Heat to 1200/1250F(650/675C), hold two hours, cool in still air.
Hardened Material: Heat to 25F(15C) below original tempering temperature, hold two hours, cool in still air.


Use H-11 or other hot work tool steel filler material.

Annealed Material:Preheat to 800/1000F(430/540C). Maintain above 700F(370C) during welding. Reanneal or temper 1400F(760C) for 6 hours after welding.

Hardened Material: Preheat to 800/1000F (430/540C) minimum. Maintain above 700F(370C) during welding. Cool to 150F(65C) after welding. Temper 25F(15C) below original tempering temperature. (1000F(540C) Minimum)

Physical Properties

Modulus of Elasticity

30psix10(6) (207 GPa)
Density 0.280 lb/in3 (7861 kg/M3)
Thermal Conductivity 15.5 BTU/hr./ft./F 29 W/m/ °K)